To estimate the price of the 2017 Chevrolet Malibu I4 2.5L Turbo LS (Base) with 138500 km mileage, I first considered the selling prices of similar cars. The most relevant data point is the 2018 Malibu I4 2.5L Turbo LS (Base) with 91000 km sold for 44500 SAR in October 2023. Given the 2017 model is a year older and has higher mileage, its value should be lower. Another relevant data point is the 2015 Malibu I4 2.4L Turbo LS (Base) with 200000 km sold for 15000 SAR in March 2024, but this car is older and has more mileage. The 2016 Malibu I4 2.5L with 188000 km sold for 10000 SAR in June 2024, but this is a different variant. The listed prices for 2017 models were 43500 SAR and 32500 SAR, but these are not actual selling prices. Considering the depreciation and the condition of the car, I estimate the market price to be slightly lower than the 2018 model sold price, accounting for the higher mileage and age.